Energy-saving auxiliary box

The utility model discloses an energy-saving auxiliary box which is installed on a second shaft of a gearbox, an auxiliary shaft transmission gear, a clutch wheel, a reverse center wheel and a center wheel are installed on the second shaft, a pin roller is installed on the reverse center wheel, a pin roller is installed on the center wheel, a transmission drum wheel is installed on the center wheel in the radial direction, and a drum wheel combination tooth is installed on the transmission drum wheel in the axial direction and fixedly connected with the transmission drum wheel. A push rod is arranged on the counter-center wheel; a compound gear is arranged on the clutch wheel in the radial direction; the clutch shifting fork, the clutch wheel and the compound gear are connected with the air cylinder, so that the vehicle is prevented from sliding; an output gear is installed on a rolling bearing of the transmission drum wheel, a low-gear clutch wheel and a low-gear gear are installed on the output gear in the